Mid back pain

Hey guys, I see back issues is a common theme but my issue seems slightly different to the others posted on here. I started running again this week after a long hiatus and after the 3rd run I developed a sharp pain in the centre of my back in a very localised area. On my 4th run today it did was bad to begin with but did ease the further I got into the run. I spent a lot of time choosing the correct shoes, so I would imagine that is not the issue...also since my time off from running I have developed a significant spare tyre around my middle (!) could this by pulling on my back. Has anybody else experienced this type of back pain. Any thoughts or advise would be great, thanks.

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